(a) DOE shall determine, under the procedures in the CEQ Regulations and this part, whether any DOE proposal:

(1) Requires preparation of an EIS;

(2) Requires preparation of an EA; or

(3) Is categorically excluded from preparation of either an EIS or an EA.

DOE shall prepare any pertinent documents as required by NEPA, the CEQ Regulations, or this part.

(b) Notwithstanding any other provision of these regulations, DOE may prepare a NEPA document for any DOE action at any time in order to further the purposes of NEPA. This may be done to analyze the consequences of ongoing activities, support DOE planning, assess the need for mitigation, fully disclose the potential environmental consequences of DOE actions, or for any other reason. Documents prepared under this paragraph shall be prepared in the same manner as DOE documents prepared under paragraph (a) of this section.